test(qb): Add tests for qb section (#74)

test(qb): Add missing tests for qb directory

* Add a GROUP BY test without Columns
* Add LtFunc test
* Add LtOrEqFunc test
* Add GtFunc test
* Add GtOrEqFunc test
* Add a Select with a AS between one column test
* Add a Order By DESC test
* Add Sum test
* Add Avg test
* Add Max test
* Add 2 tests for FuncColumn
* Add SetNamed test
* Add AddFunc test
* Add RemoveFunc test
* Add TTL and TimestampNamed test
* Add TTLNamed and Timestamp test
* Add TTL with negative or no duration test
* Add LtFunc test
* Add LtOrEqFunc test
* Add GtFunc test
* Add GtOrEqFunc test
* Add a Select with a AS between one column test
* Add a Order By DESC test
* Add Sum test
* Add Avg test
* Add Max test
* Add SetNamed test
* Add AddFunc test
* Add RemoveFunc test
* Add TTL and TimestampNamed test
* Add TTLNamed and Timestamp test
* Add TTL with negative or no duration test
* Add LtFunc test
* Add LtOrEqFunc test
* Add GtFunc test
* Add GtOrEqFunc test
* Add a Select with a AS between one column test
* Add a Order By DESC test
* Add Sum test
* Add Avg test
* Add Max test
* Add 2 tests for FuncColumn
* Add SetNamed test
* Add AddFunc test
* Add RemoveFunc test
* In qb/select.go, if there are no colums and the query have a GroupBy
statement then the query will be malformated.
* In qb/utils.go, refactor writeCql with a strings.Join call.

Fixes #78

qb/insert_test.go

@@ -76,6 +76,17 @@ func TestInsertBuilder(t *testing.T) {
 			S: "INSERT INTO cycling.cyclist_name (id,user_uuid,firstname) VALUES (?,?,?) IF NOT EXISTS ",
 			N: []string{"id", "user_uuid", "firstname"},
 		},
+		// Add FuncColumn
+		{
+			B: Insert("cycling.cyclist_name").FuncColumn("id", Now()),
+			S: "INSERT INTO cycling.cyclist_name (id) VALUES (now()) ",
+			N: nil,
+		},
+		{
+			B: Insert("cycling.cyclist_name").FuncColumn("id", Now()).Columns("user_uuid"),
+			S: "INSERT INTO cycling.cyclist_name (id,user_uuid) VALUES (now(),?) ",
+			N: []string{"user_uuid"},
+		},
 	}
 
 	for _, test := range table {